When my wife and I were in grad school, we got 2 kittens. They really entertained each other. Our next door neighbor had a single older cat. The cat had a weig

When my wife and I were in grad school, we got 2 kittens. They really entertained each other. Our next door neighbor had a single older cat. The cat had a weight problem so they got a book, "How to exercise your cat". As I recall, the opening sentence was, "If you have 2 cats, you don't need this book."